Table 1 Insecticide susceptibility of An. gambiae (s.l.) from two study sites in Kome, southern Chad exposed to WHO diagnostic doses for nine insecticides (knockdown at 60Â min and percent mortality at 24Â h)
Insecticide | No. tested | Site A | Site B | ||
|---|---|---|---|---|---|
% knockdown at 60Â min (95Â % CI) | % 24Â h mortality (95Â % CI) | % knockdown at 60Â min (95Â % CI) | % 24Â h mortality (95Â % CI) | ||
Permethrin, 0.75 % | 100 | 36.7 (35.9–37.4) | 31.7 (29.0–34.3) | 37.6 (36.4–38.9) | 26.7 (25.9–27.4) |
Lamdacyhalothrin, 0.05 % | 100 | 33.3 (30.7–35.9) | 48.3 (45.5–51.1) | 25.4 (22.8–27.2) | 32.2 (27.6–35.7) |
Deltamethrin, 0.05 % | 100 | 76.6 (72.7–80.5) | 73.3 (69.4–77.2) | 76.7 (75.9–77.4) | 56.7 (55.9–57.4) |
DDT, 4.0 % | 100 | 33.3 (31.4–35.2) | 20.0 (18.7–21.3) | 41.7 (39.8–43.6) | 40.0 (38.7–41.3) |
Fenithrothion, 1.0 % | 100 | – | 100 (100–100) | – | 100 (100–100) |
Malathion, 5 % | 100 | – | 100 (100–100) | – | 100 (100–100) |
Pirimiphos methyl, 0.9 % | 100 | – | 100 (100–100) | – | 98.3 (97.6–99.0) |
Propoxur, 0.1 % | 100 | – | 41.7 (34.6–48.7) | – | – |
Bendiocarb, 0.1 % | 100 | – | 21.7 (19.8–23.6) | – | 20.3 (19.3–21.6) |